Rockwell Automation 5370-CVIM2 Module - Manual (Page 274)

Chapter 7
Inspection Tools
7–36
Contour Measurement Fields
The contour measurement fields consist of three columns whose contents and
functions are described briefly as follows:
Right Column –– This column contains the full list of contour measurement
functions. Here is a brief description of each:
•
*Height –– This is the distance, in pixels, from the topmost to the
bottommost part of the object,.
•
*Length –– This is the distance, in pixels, from the leftmost to the
rightmost part of the object.
•
*Perimeter –– This is the distance, in pixels, around the object.
•
*Roundness –– This is a percentage measure of the degree to which the
perimeter of an object is circular. Thus, a perfectly circular perimeter
would yield 100% with the roundness measurement.
•
*Area –– This is the area of the object, in pixels.
•
X Center –– This is the position of the centroid of the object, in pixels,
along the X–axis of the image field.
•
Y Center –– This is the position of the centroid of the object, in pixels,
along the Y–axis of the image field.
•
Inertia –– This is a measure of the distribution of mass in an object.
•
Circularity –– This is a percentage measure of the degree to which the
overall object is circular, not just the perimeter. Thus, an object may have
high circularity even when the perimeter is not circular (example: a gear
with its teeth).
•
Theta –– This is a measure of the angle between the major axis of an
object and the X–axis of the image field.
•
Theta Minor –– This is a measure of the angle between the minor axis of
an object and the X–axis of the image field.
•
Min Radius –– This is the distance, in pixels, from the centroid of an
object to the nearest point on the contour of the object.
•
Max Radius –– This is the distance, in pixels, from the centroid of an
object to the farthest point on the contour of the object.
•
**H Size –– This is the length of an object along its minor axis.
•
**L Size –– This is the length of an object along its major axis.
*These measurement functions are always calculated, even if they are not
enabled. Each of the remaining functions require additional calculation time;
thus, selecting one (or more) of these functions will increase the total
calculation time.
**These measurement functions are active only for Catalog No.
5370–CVIM2AC, which is a CVIM2 module equipped with an Advanced
Contour Extractor (ACE) daughter board.